Variables or Placeholders for MSP Patch My PC Cloud

I would like the possibility to create Global Variables or Placeholders which can be assigned with customer specific values under each customer in the MSP Portal.

it should then be possible to use the global variable as an Additional Argument on install parameters on and application.
i.e license keys.

https://docs.patchmypc.com/installation-guides/patch-my-pc-cloud/deployments/deploy-an-app/configurations-deployments/install-parameters-deployments

I this way you can create a generic application with customer specific license key and deploy it using app_sets.

The idea is:

GLOBAL VARIABLE:

%APPLICENSEKEY%

CUSTOMERS:

Customer_A: %APPLICENSEKEY% = 123456789

Customer_B: %APPLICENSEKEY% = 987654321

GENERIC APPLICATION INSTALL PARAMETET:

/QN /LicenseKey %APPLICENSEKEY%

During the installation the product will then be activated with the specific license key for customer.